Sofa



FIG. 1 is a front perspective view of a sofa;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a second rear view showing the middle portion thereof.

CLAIM The ornamental design for sofa, as shown and described.